scholarly journals Hydroclimatic association of the monthly summer monsoon rainfall over India with large-scale atmospheric circulations from tropical Pacific Ocean and the Indian Ocean region

2006 ◽  
Vol 7 (4) ◽  
pp. 101-107 ◽  
Author(s):  
Rajib Maity ◽  
D. Nagesh Kumar
Keyword(s):  
Pacific Ocean ◽  
Indian Ocean ◽  
Summer Monsoon ◽  
Large Scale ◽  
Monsoon Rainfall ◽  
Summer Monsoon Rainfall ◽  
Tropical Pacific Ocean ◽  
Indian Ocean Region ◽  
Ocean Region ◽  
The Indian Ocean

scholarly journals Somali Piracy and the Monsoon

2013 ◽  
Vol 5 (4) ◽  
pp. 309-316 ◽  
Author(s):  
Duncan Cook ◽  
Sally Garrett
Keyword(s):  
Indian Ocean ◽  
Summer Monsoon ◽  
Surface Wind ◽  
Indian Ocean Region ◽  
Sea State ◽  
Wind Speeds ◽  
Ocean Region ◽  
Wave Heights ◽  
The Indian Ocean ◽  
Somali Jet

Abstract Analysis of the weather and ocean conditions during recent pirate attacks in the Indian Ocean region suggests that the transition of the summer monsoon limits maritime piracy. A comparison of all known pirate attacks in the region in 2010–11 with surface observations from Socotra and the Somali jet index during the same period indicates that pirates attacking from skiffs are thwarted when winds blow in excess of 9 m s−1. The wind speeds and sea states encountered by pirates during individual attacks were reconstructed using satellite altimetry data for 2010–11. Mean daily wind speeds of up to 20 m s−1 during the two boreal summers resulted in consistently rough seas across the Arabian Sea and Indian Ocean. Surface wind speeds during pirate attacks were generally low (less than 8 m s−1), and once wind speeds exceeded 9 m s−1 no successful attacks occurred. The majority (94%) of pirate attacks took place in waves of sea state 4 or less (wave heights below 2.5 m), with pirates rarely attacking after the rough seas of the summer monsoon evolved. Wind speeds and wave heights during the winter monsoon, premonsoon [March–May (MAM)], and postmonsoon [September–November (SON)] seasons were not a deterrent for pirates operating in the Indian Ocean region.

The Influence of Tropical Indian Ocean SST on the Indian Summer Monsoon

2007 ◽  
Vol 20 (13) ◽  
pp. 3083-3105 ◽  
Author(s):  
Annalisa Cherchi ◽  
Silvio Gualdi ◽  
Swadhin Behera ◽  
Jing Jia Luo ◽  
Sebastien Masson ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Indian Ocean ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Tropical Indian Ocean ◽  
Tropical Pacific Ocean ◽  
Sst Variability ◽  
The Indian Ocean ◽  
Sst Anomalies ◽  
The Tropical Pacific

Abstract The Indian summer monsoon (ISM) is one of the main components of the Asian summer monsoon. It is well known that one of the starting mechanisms of a summer monsoon is the thermal contrast between land and ocean and that sea surface temperature (SST) and moisture are crucial factors for its evolution and intensity. The Indian Ocean, therefore, may play a very important role in the generation and evolution of the ISM itself. A coupled general circulation model, implemented with a high-resolution atmospheric component, appears to be able to simulate the Indian summer monsoon in a realistic way. In particular, the features of the simulated ISM variability are similar to the observations. In this study, the relationships between the ISM and tropical Indian Ocean (TIO) SST anomalies are investigated, as well as the ability of the coupled model to capture those connections. The recent discovery of the Indian Ocean dipole mode (IODM) may suggest new perspectives in the relationship between ISM and TIO SST. A new statistical technique, the coupled manifold, is used to investigate the TIO SST variability and its relation with the tropical Pacific Ocean (TPO). The analysis shows that the SST variability in the TIO contains a significant portion that is independent from the TPO variability. The same technique is used to estimate the amount of Indian rainfall variability that can be explained by the tropical Indian Ocean SST. Indian Ocean SST anomalies are separated in a part remotely forced from the tropical Pacific Ocean variability and a part independent from that. The relationships between the two SSTA components and the Indian monsoon variability are then investigated in detail.

scholarly journals Indian Ocean Dipole : Assessing its impacts on the Indian Summer Monsoon Rainfall (ISMR) across North East India

MAUSAM ◽  
2021 ◽  
Vol 72 (4) ◽  
pp. 821-834
Author(s):  
PARTHAPRATIM SARKAR ◽  
PRASHANTH JANARDHAN ◽  
PARTHAJIT ROY
Keyword(s):  
Indian Ocean ◽  
Summer Monsoon ◽  
Monsoon Rainfall ◽  
Indian Summer Monsoon Rainfall ◽  
Summer Monsoon Rainfall ◽  
Moisture Movement ◽  
North East India ◽  
North East ◽  
Wind Circulation ◽  
The Indian Ocean

The Indian Ocean Dipole (IOD), a climatic anomaly, results in sustained sea surface temperature (SST) variations between tropical western and eastern Indian Ocean temperatures. In this study, we studied the variations to inculcate the teleconnections between IOD and Indian summer monsoon rainfall (ISMR) distribution across the country for the period 1960-2020 for all the three phases of ISMR. We analyzed rainfall, SST and low-level wind circulation anomalies for the above mentioned time horizon. Positive IOD events noticeably resulted in increase in summer monsoon rainfall distribution across the country respectively while its negative counterpart led to decrease in rainfall except for the commencement phase of ISMR. The variations in SST, wind circulation and moisture movement processes across the Indian Ocean characterize significant changes in rainfall during the positive and negative phases of IOD especially during the recent decades (1991-2020). The recent time horizon also witnesses enhanced low-level equatorial jets (LEJ) across the equatorial Indian Ocean and the Arabian Sea during the positive IOD events as compared to the prior decades (1960-1990). The effect of moisture convergence zone is also analyzed which results in above rainfall conditions across northeastern and central India. Conversely, negative IOD events were found to subdue any such moisture movement mechanisms. Furthermore, and additional investigation to analyze the effect of IOD on the retreating/withdrawal monsoon across northeast India has been done and it has been observed that a stronger positive IOD is detrimental to the seasonal rainfall (May- September) over North East India (-0.7 one month lag correlation). Furthermore, the DMI index of April-May presented a clear indication of monsoon activity over the area during the withdrawal or retreating phase of the summer monsoon, i.e., during September.

scholarly journals “Soft Power” of the Indian Navy in the Pandemic Era

2020 ◽  
pp. 40-51
Author(s):  
A. Kupriyanov
Keyword(s):  
Indian Ocean ◽  
Air Force ◽  
Soft Power ◽  
Large Scale ◽  
Indian Ocean Region ◽  
Political Role ◽  
Ocean Region ◽  
The Indian Ocean ◽  
High Level ◽  
Hospital Ships

The article describes and analyzes the activities of the Indian Navy during the COVID-19 pandemic. The author looks at the experience of the Indian Navy at the beginning of the pandemic, noting that it mainly consisted of helping the states of the Indian Ocean region affected by hurricanes and monsoons, and evacuating Indian citizens and residents of neighboring countries from areas of hostilities. At the same time, the Indian Navy did not have specialized floating hospitals. The author analyzes the situation in which India found itself at the beginning of the pandemic: a gradual slowdown in GDP growth questioned the further expansion of the Navy, and the outbreak of conflict with China further emphasized the importance of the Air Force and the Army. In these conditions, the Indian Navy was forced to prove its value for the Indian external and domestic policy. The author then describes how the Indian Navy fought COVID-19, concluding that Indian sailors were able to prevent the pandemic from spreading to naval bases and ships. The Navy fully retained its combat capability and was able to take part in two large-scale operations: the “Samudra Setu”and “Sagar” missions. During the former, several thousand people were evacuated from Iran, Sri Lanka and the Maldives, the latter involved providing medical assistance to the population of the Maldives, Seychelles, Comoros, Madagascar and Mauritius affected by the pandemic. The author notes the high level of organization of both missions, which made it possible to avoid pandemic spreading among the ship crews. He argues that the conduct of Operation “Sagar” allowed India to increase its influence in the Indian Ocean region amid the pandemic and demonstrate its role as a security provider countering unconventional threats. The author then describes the joint exercises carried out by the Indian Navy during the pandemic and notes their significant political role. In conclusion, he analyzes the experience of the Indian Navy using soft power and proposes an original concept of “floating soft power” based on the constant presence of hospital ships in remote regions. In his opinion, this format of presence could also be suitable for projecting Russian interests in the South Pacific.

Indian Ocean Dipole : Assessing its impacts on the Indian Summer Monsoon Rainfall (ISMR) across North East India

MAUSAM ◽  
2021 ◽  
Vol 72 (4) ◽  
pp. 821-834
Author(s):  
PARTHAPRATIM SARKAR ◽  
PRASHANTH JANARDHAN ◽  
PARTHAJIT ROY
Keyword(s):  
Indian Ocean ◽  
Summer Monsoon ◽  
Monsoon Rainfall ◽  
Indian Summer Monsoon Rainfall ◽  
Summer Monsoon Rainfall ◽  
Moisture Movement ◽  
North East India ◽  
North East ◽  
Wind Circulation ◽  
The Indian Ocean

The Indian Ocean Dipole (IOD), a climatic anomaly, results in sustained sea surface temperature (SST) variations between tropical western and eastern Indian Ocean temperatures. In this study, we studied the variations to inculcate the teleconnections between IOD and Indian summer monsoon rainfall (ISMR) distribution across the country for the period 1960-2020 for all the three phases of ISMR. We analyzed rainfall, SST and low-level wind circulation anomalies for the above mentioned time horizon. Positive IOD events noticeably resulted in increase in summer monsoon rainfall distribution across the country respectively while its negative counterpart led to decrease in rainfall except for the commencement phase of ISMR. The variations in SST, wind circulation and moisture movement processes across the Indian Ocean characterize significant changes in rainfall during the positive and negative phases of IOD especially during the recent decades (1991-2020). The recent time horizon also witnesses enhanced low-level equatorial jets (LEJ) across the equatorial Indian Ocean and the Arabian Sea during the positive IOD events as compared to the prior decades (1960-1990). The effect of moisture convergence zone is also analyzed which results in above rainfall conditions across northeastern and central India. Conversely, negative IOD events were found to subdue any such moisture movement mechanisms. Furthermore, and additional investigation to analyze the effect of IOD on the retreating/withdrawal monsoon across northeast India has been done  and it has been observed that a stronger positive IOD is detrimental to the seasonal rainfall (May- September) over North East India (-0.7 one month lag correlation). Furthermore, the DMI index of April-May presented a clear indication of monsoon activity over the area during the withdrawal or retreating phase of the summer monsoon, i.e., during September.

A Contest of Status and Legitimacy in the Indian Ocean

2018 ◽  
Author(s):  
David Brewster
Keyword(s):  
Indian Ocean ◽  
International System ◽  
Special Role ◽  
Indian Ocean Region ◽  
Major Powers ◽  
Threat Perceptions ◽  
Ocean Region ◽  
The Status ◽  
The Indian Ocean ◽  
The Asymmetry

This chapter examines Indian and Chinese perspectives of each other as major powers and their respective roles in the Indian Ocean. It focuses on the following elements: (a) China’s strategic imperatives in the Indian Ocean Region, (b) India’s views on its special role in the Indian Ocean and the legitimacy of the presence of other powers, (c) China’s strategic vulnerabilities in the Indian Ocean and India’s wish to leverage those vulnerabilities, (d) the asymmetry in Indian and Chinese threat perceptions, and (d) Chinese perspectives of the status of India in the international system and India’s claims to a special role in the Indian Ocean. The chapter concludes that even if China were to take a more transparent approach to its activities, significant differences in perceptions of threat and over status and legitimacy will produce a highly competitive dynamic between them in the maritime domain.

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